Effect of grain boundary character distribution on mechanical properties of Hastelloy alloy

doi:10.13251/j.issn.0254-6051.2021.06.040

Abstract

Abstract: Effect of grain boundary character distribution (GBCD) on mechanical properties of the Hastelloy X (HX) alloy was investigated. Scanning electron microscopy (SEM), electron backscattered diffraction (EBSD) and transmission electron microscope (TEM) were employed to examine the GBCD, fracture morphology and dislocation distributes. The results show that the tensile fracture at room temperature is composed of local cracks, dimples, and voids related to second phase precipitates. The cracking of the material with intragranular coherent twin structure is caused by the propagation of crack source, while that with incoherent twins is induced by microvoid coalescence. It indicates that the difference of mechanical properties at room temperature of the specimen with different grain boundary character distributions is mainly due to the effect of grain size and primary carbide distribution.

Key words: Hastelloy alloy, grain boundary character distribution(GBCD), mechanical properties

CLC Number:

TG161

Wang Xiaoyan, Han Junjie, Sun Daofeng, Ren Qiqi, Yang Haoxin, Zhang Yongjian. Effect of grain boundary character distribution on mechanical properties of Hastelloy alloy[J]. Heat Treatment of Metals, 2021, 46(6): 205-208.

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